Patients with chronic heart failure had significantly lower global left ventricular perfusion and coronary flow reserve after pharmacological stress compared to healthy controls (P<0.001).
Case-Control (n=31)
Does cardiac MRI with phase-contrast VEC accurately quantify differences in global LV perfusion and coronary flow reserve between patients with ischemic chronic heart failure and healthy controls?
Phase-contrast VEC MRI can effectively quantify impaired global LV perfusion and coronary flow reserve in patients with ischemic chronic heart failure.
p-value: p=<0.001
BACKGROUND: Coronary sinus flow reflects global cardiac perfusion and has been used for the assessment of myocardial flow reserve, which is reduced in chronic heart failure(CHF). Coronary flow reserve (CFR) can be measured by using phase-contrast (PC)velocity-encoded cine (VEC) magnetic resonance imaging (MRI). PURPOSE: To quantify and compare global left ventricular (LV) perfusion and CFR inpatients with CHF and in a healthy control group by measuring coronary sinus flow with PC VEC MRI, and to correlate this with global LV perfusion, segmental first-pass perfusion, and viability in the same patients. MATERIAL AND METHODS: Cardiac MRI was performed in 20 patients with CHF of ischemic origin and in a control group of healthy subjects (n=11) at rest and after pharmacological stress induced by i.v. dipyridamole. The MRI protocol included cine MRI, VEC MRI, first-pass perfusion, and delayed contrast-enhanced MRI for viability.Global LV perfusion was quantified by measuring coronary sinus flow on VEC MRI at rest in all subjects. CFR was determined as the ratio of global LV perfusion before and after pharmacologic stress. RESULTS: At rest, global LV perfusion was not significantly different in patients with CHF and the control group. After administration of dipyridamole, global LV perfusion and CFR were significantly lower in patients with CHF compared to the control group(P<0.001). An inverse correlation was observed between CFR and the number of infarcted and/or ischemic segments (P=0.083, P=0.037). CONCLUSION: A combined cardiac MRI protocol including function and perfusion techniques together with VEC MRI can be used to evaluate global LV perfusion and CFR in patients with CHF. Global LV perfusion and CFR measurements may have potential in the monitoring of CHF. Impaired CFR may contribute to progressive decline in LV function in patients with CHF.
Aras et al. (Mon,) conducted a case-control in Chronic heart failure due to coronary artery disease (n=31). Chronic heart failure vs. Healthy control group was evaluated on Global left ventricular perfusion and coronary flow reserve after dipyridamole administration (p=<0.001). Patients with chronic heart failure had significantly lower global left ventricular perfusion and coronary flow reserve after pharmacological stress compared to healthy controls (P<0.001).